Black Guan
Chamaepetes unicolor
Large chickenlike bird found in montane forests. Entirely black plumage with blue facial skin, red eye, and reddish legs. Sexes similar. Unlikely to be confused: smaller and blacker than Crested Guan; lacks curled head feathers of Great Curassow; also found at higher elevations. Can be seen on the ground or in trees, usually in pairs or small family groups. Feeds on fruit.
识别特征
The black guan is 62 to 69 cm (2.03 to 2.26 ft) long and weighs about 1,135 g (2.502 lb). Adults have all black plumage with contrasting bright blue facial skin around a red eye. Their legs and feet are pinkish-red. Juveniles are similar but less glossy and their underparts browner and their facial skin is blackish or dark brown.
分类信息
The black guan shares the genus Chamaepetes with the sickle-winged guan (C. goudotii) of western South America and may form a superspecies with it.
- 学名
- Chamaepetes unicolor
- 命名信息
- Salvin, 1867
- 目
- Galliformes
- 科
- Cracidae
- 属
- Chamaepetes
分布与栖息地
The black guan is found from the Cordillera de Guanacaste in northern Costa Rica to western Coclé Province in Panama. It inhabits cloudforest in the Talamancan montane forest ecozone. It prefers steep terrain in the temperate, subtropical, and tropical zones, usually between about 1,000 and 2,250 m (3,280 and 7,380 ft) of elevation, but in some areas as low as 800 m (2,600 ft) and in others as high as 3,000 m (9,800 ft).
- 迁徙
- Resident species
行为
The black guan is thought to be mainly sedentary but there is some evidence of seasonal elevation changes.<p>The black guan forages singly, in pairs, or in small groups. Its primary diet is fruits; studies in Costa Rica have identified at least 35 different species eaten. It mostly feeds in trees but will also eat fallen fruit on the ground.<p>The black guan's breeding season is believed to span from February to June. The one described nest was a small platform of twigs and leaves placed in a clump of epiphytes in a tree 4.5 m (15 ft) above the ground. The clutch size is two or three eggs.<p>The black guan's vocalizations include piping calls in the breeding season, a "a low, deep 'ro-rooo' or coughing 'kowr' if disturbed", and a "tsik tsik..." alarm call. At dawn and dusk it gives a "loud, sharp, crackling" wing-rattling display.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Brazza's Martin
Phedinopsis brazzae
A typical martin with brown upperparts and pale underparts strongly marked with dark streaks. Juvenile is rustier, with a paler chin and throat, and is less boldly streaked below. Resident and restricted to forest-fringed rivers between south Congo and central Angola, breeding in small groups in sandbanks. Despite being fairly common, the species’ vocalizations are unknown. No other martins within its range are streaked below.
Gray-green Scrubwren
Aethomyias arfakianus
A small bird of lower montane forest interior. Whitish belly, pale gray head and greenish wing. Pale grayish wash on the chest with faint streaking, offsetting the whitish throat. Actively searches leaves and branches for insects in small groups. Co-occurs at elevations with other scrubwrens including Vogelkop, Pale-billed and Perplexing, but Gray-green has olive rather than warm brown upperparts. Song, a scratchy jumble of notes followed by an up and down “chi-doo! chi-doo! chi-doo!”. Calls, various raspy, nasal notes and chattering.
Falcated Duck
Mareca falcata
An East Asian teal-like duck. Males are distinctive, with an iridescent head that flashes green and copper, a silvery body with distinct scalloping, extremely long curved tertials, long pale scapulars, and a triangular white throat patch outlined in dark green. Brownish females resemble female Gadwall but have a dark bill. Breeds in northern interior marshes and winters on rivers, lakes, and coastal wetlands, often in flocks with other ducks.
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